Sounder SIPS: AQUA AIRS IR + MW Level 3 CLIMCAPS : Comprehensive Quality Control Gridded Daily V2 at GES DISC

WARNING: To users of the derived product “co_mmr_midtrop” (carbon monoxide mass mixing ratio to dry air [kg/kg] at ~500 hPa). This variable has a significant bias due to a conversion error: the molecular weight of carbon dioxide (CO2, 44.01 g/mol) was used instead of carbon monoxide (CO, 28.01 g/mol). To correct, simply multiply “co_mmr_midtrop” by 28.01/44.01. Alternatively, derive a profile of mass mixing ratio from scratch using the retrieved column density values (“mol_lay/co_mol_lay”) in the Level 2 files. For further questions or concerns please contact the Sounder SIPS at: sounder.sips@jpl.nasa.gov

The CLIMCAPS (Community Long-term Infrared Microwave Coupled Product System) algorithm is used to analyze data from the AIRS (Atmospheric Infrared Sounder) and AMSU (Advanced Microwave Sounding Unit). The AIRS instrument is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. The AIRS in combination with the AMSU constitutes an innovative atmospheric sounding group of infrared and microwave sensors. The AIRS Standard Retrieval Product consists of retrieved estimates of cloud and surface properties, plus profiles of retrieved temperature, water vapor, ozone, carbon monoxide and methane. The temperature profile vertical resolution is 100 levels total between 1100 mb and 0.1 mb, while moisture profile is reported at atmospheric layers between 1100 mb and 300 mb. The horizontal resolution is 50 km.

The CLIMCAPS algorithm uses an Optimal Estimation methodology and uses an a-priori first guess to start the process. A CLIMCAPS sounding is comprised of a set of parameters that characterizes the full atmospheric state and includes a variety of geophysical parameters derived from the CrIMSS data. These include surface temperature and infrared emissivity; full atmosphere profiles of temperature, water vapor and ozone; infrared effective cloud top characteristics; carbon monoxide, methane, carbon dioxide, sulfur dioxide, nitrous oxide, and nitric acid.

This daily one degree latitude by one degree longitude level-3 product starts with level-2 retrieval products applying the comprehensive quality control (QC) methodology. Comprehensive QC accepts a retrieval if the profile is good to the surface and ensures consistent analysis across all levels and variables.

Data and Resources

Additional Info

Field Value
Maintainer Lena Iredell
Last Updated April 1, 2025, 00:07 (UTC)
Created April 1, 2025, 00:07 (UTC)
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
citation Chris Barnet. 2019-01-15. SNDRAQIML3CDCCP. Version 2. Sounder SIPS: AQUA AIRS IR + MW Level 3 CLIMCAPS : Comprehensive Quality Control Gridded Daily V2. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://doi.org/10.5067/MAIIRGMT0JPH. https://disc.gsfc.nasa.gov/datacollection/SNDRAQIML3CDCCP_2.html. Digital Science Data.
creator Chris Barnet
data-presentation-form Digital Science Data
graphic-preview-description Sample plot of AIRS/AMSU Level 3 Retrieval.
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/SNDRAQIML3CDCCP_2.png
harvest_object_id f410d290-d9b1-4342-bfe5-2648e85b922d
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1693440804-GES_DISC
issued 2002-08-31
landingPage https://doi.org/10.5067/MAIIRGMT0JPH
language {en-US}
metadata_type geospatial
modified 2016-09-26
programCode {026:001}
publisher Not provided
references {https://doi.org/10.3390/rs11101227,https://doi.org/10.1109/TGRS.2012.2220369,https://doi.org/Sounder%20SIPS%3A%20Suomi%20NPP%20CrIMSS%20Level%203%20Comprehensive%20Quality%20Control%20Gridded%20Daily%20CLIMCAPS%20Normal%20Spectral%20Resolution%20V1,https://doi.org/10.1109/TGRS.2002.808236,https://doi.org/10.1029/2005/JD007020,https://doi.org/10.5194/amt-13-4437-2020}
release-place Greenbelt, MD, USA
resource-type Dataset
series-name SNDRAQIML3CDCCP
source_datajson_identifier true
source_hash 58c35d10cc077760cd5d302ac5ee35b4ec535e35bf953195d680c96354be7377
source_schema_version 1.1
spatial -180.0 -90.0 180.0 90.0
temporal 2002-08-31T00:00:00Z/2023-02-28T00:00:00Z
theme {Aqua,geospatial}